Hi Vanessa. I have fluctuating BP due to the aunomic distrubance of CRPS. UK research has proven you can reduce your BP overall with controlled breathing. In the US a company called Resmet makes a maching ($299 in US) which if used 3 times a week will reduce your BP naturally. I have a link to it on my blog. I can't take meds so have had to find alternatives. My physiotherapist said if you breathe out twice as long as in for 15 minutes you will activate the parasympathetic nervous system and bring about a balance between the sympathetic and parasympathetic syatem. tnis appears to be the principle behind the maching. It is a yoga style of breathing and is what the British studies were about I think.
http://www.crps-rsd-a-better-life.blogspot.com/
Look to the left of the blog under crps/rsd related links. Click on the resmet one and you can see a short video.
Take care
jeisea